Description: Various Debian-specific configuration changes
 ssh: Enable ForwardX11Trusted, returning to earlier semantics which cause
 fewer problems with existing setups (http://bugs.debian.org/237021).
 .
 ssh: Set 'SendEnv LANG LC_*' by default (http://bugs.debian.org/264024).
 .
 ssh: Enable HashKnownHosts by default to try to limit the spread of ssh
 worms.
 .
 ssh: Enable GSSAPIAuthentication and disable GSSAPIDelegateCredentials by
 default.
 .
 sshd: Refer to /usr/share/doc/openssh-server/README.Debian.gz alongside
 PermitRootLogin default.
 .
 Document all of this, along with several sshd defaults set in
 debian/openssh-server.postinst.
Author: Colin Watson <cjwatson@debian.org>
Author: Russ Allbery <rra@debian.org>
Forwarded: not-needed
Last-Update: 2013-05-16

Index: b/readconf.c
===================================================================
--- a/readconf.c
+++ b/readconf.c
@@ -1288,7 +1288,7 @@
 	if (options->forward_x11 == -1)
 		options->forward_x11 = 0;
 	if (options->forward_x11_trusted == -1)
-		options->forward_x11_trusted = 0;
+		options->forward_x11_trusted = 1;
 	if (options->forward_x11_timeout == -1)
 		options->forward_x11_timeout = 1200;
 	if (options->exit_on_forward_failure == -1)
Index: b/ssh_config
===================================================================
--- a/ssh_config
+++ b/ssh_config
@@ -17,9 +17,10 @@
 # list of available options, their meanings and defaults, please see the
 # ssh_config(5) man page.
 
-# Host *
+Host *
 #   ForwardAgent no
 #   ForwardX11 no
+#   ForwardX11Trusted yes
 #   RhostsRSAAuthentication no
 #   RSAAuthentication yes
 #   PasswordAuthentication yes
@@ -47,3 +48,7 @@
 #   PermitLocalCommand no
 #   VisualHostKey no
 #   ProxyCommand ssh -q -W %h:%p gateway.example.com
+    SendEnv LANG LC_*
+    HashKnownHosts yes
+    GSSAPIAuthentication yes
+    GSSAPIDelegateCredentials no
Index: b/ssh_config.5
===================================================================
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -71,6 +71,22 @@
 host-specific declarations should be given near the beginning of the
 file, and general defaults at the end.
 .Pp
+Note that the Debian
+.Ic openssh-client
+package sets several options as standard in
+.Pa /etc/ssh/ssh_config
+which are not the default in
+.Xr ssh 1 :
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+.Cm SendEnv No LANG LC_*
+.It
+.Cm HashKnownHosts No yes
+.It
+.Cm GSSAPIAuthentication No yes
+.El
+.Pp
 The configuration file has the following format:
 .Pp
 Empty lines and lines starting with
@@ -502,7 +518,8 @@
 Remote clients will be refused access after this time.
 .Pp
 The default is
-.Dq no .
+.Dq yes
+(Debian-specific).
 .Pp
 See the X11 SECURITY extension specification for full details on
 the restrictions imposed on untrusted clients.
Index: b/sshd_config
===================================================================
--- a/sshd_config
+++ b/sshd_config
@@ -37,6 +37,7 @@
 # Authentication:
 
 #LoginGraceTime 2m
+# See /usr/share/doc/openssh-server/README.Debian.gz.
 #PermitRootLogin yes
 #StrictModes yes
 #MaxAuthTries 6
Index: b/sshd_config.5
===================================================================
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -57,6 +57,33 @@
 .Pq \&"
 in order to represent arguments containing spaces.
 .Pp
+Note that the Debian
+.Ic openssh-server
+package sets several options as standard in
+.Pa /etc/ssh/sshd_config
+which are not the default in
+.Xr sshd 8 .
+The exact list depends on whether the package was installed fresh or
+upgraded from various possible previous versions, but includes at least the
+following:
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+.Cm Protocol No 2
+.It
+.Cm ChallengeResponseAuthentication No no
+.It
+.Cm X11Forwarding No yes
+.It
+.Cm PrintMotd No no
+.It
+.Cm AcceptEnv No LANG LC_*
+.It
+.Cm Subsystem No sftp /usr/lib/openssh/sftp-server
+.It
+.Cm UsePAM No yes
+.El
+.Pp
 The possible
 keywords and their meanings are as follows (note that
 keywords are case-insensitive and arguments are case-sensitive):